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(No Model.)

' P'DARLING. 0

. PITMAN BOX.

Patented P615. 5,1 84- WITNESSES INVENTOR BY uMM/M ATTORNEYS.

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FENN'ER I YARI'JING, ()F FRANKLIN, HASSACHUSEITS.

PlTMAN-BOX.

SPECIFIC ATION forming part of Letters Patent No. 292,994, dated February 5, 1884,

' Application filed September 14, 1883. (No model.)

To aZZ whom it may concern:

Be it known that I, FENNER Iliniyrn'c, of lh'anklin, in the county of Norfolk and State of Massachusetts, have invented a new and Improved Pitman-Box, of which the following is a full, clear, and exact description.

This invention has for its object to devise means whereby the wrist-pins of pitman-boxes may be made to retain'their cylindrical. form, and whereby they will be relieved of a part of the wear;'and to this end the invention con sists, principally, of an inner sleeve placed upon the wrist-pin, which sleeve is adapted to be revolved intermittently by the more ment of the pitman.

The invention also consists of the means employed for causing the inner sleeve to be revolved, and in forming it with an oil-groove, and with oil-holes to act in conjunction with oil-holes made through the strap and outer box, whereby free distribution of oil throughout the box is effected.

The invention also consists of the construction, arrangement, and combination of parts, all as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification, in

which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional elevation of a crosshead and pitman-connection, the box being made in accordance with my invention, the section being taken on the line 00 w of Fig.3.

Fig. 2 is a similar View taken on the line 3 of Fig. 3, showing the oil-groove and oil-holes; and Fig. 3 is a plan view of the cross-head, pitman, and box.

A represents the cross-head of the piston rod of a steam-engine, and B represents the end of aconnecting-rod 0r pitman.

O is the inner sleeve. This is placed next to the wrist-pin D, and is by preference made of brass and in three sections.

Surrounding the sleeve 0 is the box E, by preference made of Babbitt metal in D form and in two sections; and-this box E, after being placed around the sleeve 0, is secured to the end of the pitman B by the strap F and keys G G in an ordinary manner, the sleeve 0 being formed at its ends with the flanges a a, to keep the strap F in place, as will be nn derstood from the drawings. The flange a of the sleeve 0 has notches formed in it, which constitute the ratchet a with which the pawl f, made, respectively, in the box E and strap F, and the oil held in the groove 1) also lubribricates the bearing between the box E and sleeve 0.

The operation of the box is'as follows: hen the pitman-rod Bis in its highest position, as shown in full lines in Fig. 1, in passing from this position to its lowest position, (that shown in dotted lines in Fig. 1,) any fixed point in the pitman B will describe an arc of a circle whose center is the center of the wrist-pin D. The pawl H will therefore, during this move- 1nent,be carried forward and downward, and, engaging with the ratchet a, will consequently cause the sleeve 0 to turn with it, so that the sleeve and the pitman 13 during this movement will be relatively at rest with each other, causing the friction to take place between the inner surface of the sleeve 0 and the outer surface of the wrist-pin D. As the pitman B again passes to its highest position, the sleeve 0 will be held from backward movement by the pawl J, so that during this latter movement the sleeve 0, cross-head A, and wristpin D will be relatively at rest with each other, the friction being between the outer surface of the sleeve 0 and the inner surface of the box E. As the pitman continues to move, the above action is repeated, causing an intermittent rotary motion to be imparted to the sleeve Having thus described my invention, what I IOO claim as new, and desire to secure by Letters Patent, is-

1. In a pitman-box, the sleeve 0, adapted to be placed upon the wrist-pin, and adapted 2 292.99-&

to have imparted to it an intermittent rotary motion, substantially as and for the purposes set forth.

2. In a pitinan-box, the rotary sleeve 0, formed with the ratchet a, in combination with the stop-pawl J and pawl H, pivoted to pitnian B, substantially as and for the purposes set forth.

3. The pitnian-box herein shown and described, consisting of the rotary sleeve 0 and outer box, IE, placed around said sleeve, substantially as and for the purposes described.

4. The sleeve 0, formed with the oil-groove I) and oil-holes c, in combination with the box E and strap F, having oil-holes ef, respect- I 5 ively, substantially as and for the purposes set forth.

5. The sleeve 0, placed upon the Wrist-pin D and formed with the ratchet (E, in combination with the box E, strap 1*, and pawls H J, arranged to operate substantially in the man ner and for the purposes set forth.

FENNER DARLING.

\Vitnesses:

WILLIAM A. lVYoKoFF, ALBIN R. BLAKE. 

